slarden's build uses ftr 6 / bard 3 to take advantage of Swashbuckling and Strike w/No Thought stacking, which only works with handaxes and light picks. So if you're sticking with the same split and want to use DG weapon bonuses, well, the choice is obvious. The downside is there's
only one named light pick in DDO (fortunately it's ML:14 which makes it a perfect starter for an Iconic life); so everything else is gonna have to be crafted / lootgen weaponry.
If you plan to use a different gnomish weapon, then there's no particular reason to stick with bard 3 / ftr 6 since the crit bonuses don't stack. So if you decided to use e.g. light maces instead, you could do wiz 12 for wraith form and either bard 3 / ftr 5 or bard 5 / ftr 3 (depending on which tier-5 you wanted).